【摘要】 以未增塑聚氯乙烯（UPVC）管材为对象，进行高低温环境下管材力学性能试验研究，并建立不同温度环境下UPVC管材的本构模型。通过试验获得不同温度环境下管材的力学性能变化规律，提出管材的力学参数与环境温度之间的关系，建立考虑环境温度影响的管材应力-应变曲线模式，并对提出的本构模型进行验证。结果表明：UPVC管材所处的温度对其材料的性能影响较大，与常温状态下的性能相比，低温时材料的强度增加，延性与断裂应变降低；高温时材料的屈服强度和断裂应变均降低，但延性增加。依照环境温度变量，采用编制的子程序对其进行数值模拟，模拟结果与实际试验结果较为一致。更多还原

【Abstract】 The mechanical properties of unplasticized poly(vinyl chloride)(UPVC) pipe under high and low temperature environment were experimentally studied, and the constitutive models of UPVC pipe under different temperature were established. The relation between mechanical parameter and ambient temperature was proposed. A stress-strain curve model was established considering the influence of ambient temperature, and the proposed constitutive model was verified. The results indicated that the ambient temperature of UPVC pipe material has a great influence on the mechanical properties. Compared with the properties at normal temperature, the brittleness and yield strength of the material increased at low temperature, while the ductility and fracture strain decreased. At high temperature, the yield strength and fracture strain of the material decreased, while the ductility increased. Numerical analysis was carried out by using the programmed subroutine in terms of the ambient temperature variables. The numerical analysis results were in good agreement with the test ones.更多还原